Infant Growth, Weight, Height, Head Circumference, Reflexes, Motor
Development, Fine and Gross Skills, Sensory Perception, Binocularity,
Depth Perception, Language Acquisition, Prehension, Pincer Grasp,
Object Permanence, Attachment, Separation Anxiety, Stranger Fear,
Temperament, Sleep Patterns, Nutrition, Breastfeeding, Formula
Feeding, Solid Foods Introduction, Teething, Oral Health,
Immunization, Developmental Milestones, Piaget Sensorimotor Stage,
Erikson Trust vs Mistrust, Cognitive and Psychosocial Progression,
Nursing Interventions Exam Questions Verified and Provided with
Complete A+ Graded Rationales Latest Updated 2026
Calculating Infant Weight Increase:
Weight doubles at 5-6 months and triples at one year. Average weight at one year is 21 lbs.
Ex.) Birth weight was 7.2 lbs. What should be the approximate weight at 6 months? 12 months?
- 14.4 lbs at 6 months
- 21.6 lbs at 1 year
Calculating Infant Height Increase:
Grow at rate of 1" per month for first 6 months and half this in second 6 months.
Average height at one year is 29".
By 1 yr birth length has increased by 50%.
,Calculating Infant Head Circumference Increase:
Increases 2 cm/month, 0-3 months; 1 cm/month, 4-6 months; 0.5 cm/month second 6 months.
Average size is 35 cm NB, 43 cm at 6 mo, 46 cm at 12 months.
Posterior fontanel closes at 6-8 wks, anterior fontanel fuses at 12-18 mo.
Brain more than doubles in weight by 12 mo.
Landau Reflex
6-8 months
Parachute Reflex
7-9 months
Otolith Righting Reflex
7-12 months
Binocularity
Ability to focus on one object with both eyes by 4 months.
Depth Perception (Stereoposis)
Stereoposis
,7-9 months
Visual Preference
To look at a human face by 6 weeks and recognize.
At 6 months can distinguish between familiar and unfamiliar faces so stranger anxiety develops.
Hearing at Birth:
Responds to loud noise-Moro reflex.
Responds to human voice.
Hearing 8-12 weeks:
Turns head to side when sound is made at level of ear.
Hearing 16-24 weeks:
Turning head toward the sound and looking up or down towards sound.
Hearing 32 weeks:
Responding to name.
Hearing 52 weeks:
Knows several words and their meanings.
, When can a baby perform prehension, or grasp with whole hand?
2-3 months.
Grasp more voluntarily at 6 months (hold bottle, grasp toes).
When can a baby transfer objects between hands?
7 months.
When does crude pincer grasp develop?
8-9 months.
When does neat pincer grasp develop?
10-11 months.
Can offer objects to someone.
What is righting reflex?
Responsible for flexion and extension.
When should a baby be able to hold their head up?
3 months.
Poor head control increases risk of suffocation from pillow or soft surface.
Development, Fine and Gross Skills, Sensory Perception, Binocularity,
Depth Perception, Language Acquisition, Prehension, Pincer Grasp,
Object Permanence, Attachment, Separation Anxiety, Stranger Fear,
Temperament, Sleep Patterns, Nutrition, Breastfeeding, Formula
Feeding, Solid Foods Introduction, Teething, Oral Health,
Immunization, Developmental Milestones, Piaget Sensorimotor Stage,
Erikson Trust vs Mistrust, Cognitive and Psychosocial Progression,
Nursing Interventions Exam Questions Verified and Provided with
Complete A+ Graded Rationales Latest Updated 2026
Calculating Infant Weight Increase:
Weight doubles at 5-6 months and triples at one year. Average weight at one year is 21 lbs.
Ex.) Birth weight was 7.2 lbs. What should be the approximate weight at 6 months? 12 months?
- 14.4 lbs at 6 months
- 21.6 lbs at 1 year
Calculating Infant Height Increase:
Grow at rate of 1" per month for first 6 months and half this in second 6 months.
Average height at one year is 29".
By 1 yr birth length has increased by 50%.
,Calculating Infant Head Circumference Increase:
Increases 2 cm/month, 0-3 months; 1 cm/month, 4-6 months; 0.5 cm/month second 6 months.
Average size is 35 cm NB, 43 cm at 6 mo, 46 cm at 12 months.
Posterior fontanel closes at 6-8 wks, anterior fontanel fuses at 12-18 mo.
Brain more than doubles in weight by 12 mo.
Landau Reflex
6-8 months
Parachute Reflex
7-9 months
Otolith Righting Reflex
7-12 months
Binocularity
Ability to focus on one object with both eyes by 4 months.
Depth Perception (Stereoposis)
Stereoposis
,7-9 months
Visual Preference
To look at a human face by 6 weeks and recognize.
At 6 months can distinguish between familiar and unfamiliar faces so stranger anxiety develops.
Hearing at Birth:
Responds to loud noise-Moro reflex.
Responds to human voice.
Hearing 8-12 weeks:
Turns head to side when sound is made at level of ear.
Hearing 16-24 weeks:
Turning head toward the sound and looking up or down towards sound.
Hearing 32 weeks:
Responding to name.
Hearing 52 weeks:
Knows several words and their meanings.
, When can a baby perform prehension, or grasp with whole hand?
2-3 months.
Grasp more voluntarily at 6 months (hold bottle, grasp toes).
When can a baby transfer objects between hands?
7 months.
When does crude pincer grasp develop?
8-9 months.
When does neat pincer grasp develop?
10-11 months.
Can offer objects to someone.
What is righting reflex?
Responsible for flexion and extension.
When should a baby be able to hold their head up?
3 months.
Poor head control increases risk of suffocation from pillow or soft surface.
